Add missing ROS 2 build dependencies to Stage installation guide

[Copilot]

The installation guide was missing ROS 2 desktop and colcon, causing colcon build to fail with Findament_cmake not found.

Changes

• Added ROS 2 installation step after stage_ros2 clone, before rosdep:

  sudo apt install ros-humble-desktop python3-colcon-common-extensions

  Note added to skip if already installed.

• Added environment sourcing before colcon build commands:

  source /opt/ros/humble/setup.bash

  Note added that this must be repeated per terminal session.

• Updated full example section to include both steps in correct sequence

The installation flow now ensures ROS 2 and colcon are present before attempting workspace builds.

Original prompt

Problem

The installation guide in notes/Stage_Ros2_Installation.md is missing critical ROS 2 build dependencies, causing the colcon build step to fail with an error about not finding Findament_cmake.

Solution Required

Update the installation instructions to include the missing ROS 2 development packages before attempting to build. Specifically:

1. Add a new step before the "Make sure the python ros development tools are installed" section that installs the core ROS 2 build dependencies:

   sudo apt install ros-humble-desktop python3-colcon-common-extensions

2. Ensure the ROS 2 environment is sourced before running any colcon commands. Add this instruction:

   source /opt/ros/humble/setup.bash

3. Update the full example section at the bottom to include these steps in the correct order.

Expected Changes

The updated flow should be:

1. Install system dependencies (git, cmake, etc.)
2. Build and install Stage
3. Install stage_ros2 repository
4. Install ROS 2 desktop and colcon (NEW)
5. Source ROS 2 environment (NEW)
6. Install rosdep and run rosdep install
7. Build with colcon

File to Modify

• notes/Stage_Ros2_Installation.md

Additional Context

• The base branch should be the default branch
• The ROS 2 distribution appears to be Humble based on the submodule instructions
• The instructions are for Ubuntu 24.04

This pull request was created from Copilot chat.

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